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Excess Pressure Losses in the Capillary Flow of Molten Polymers by Savvas G. Hatzikiriakos; Evan Mitsoulis is a Chemical Engineering article available to read on EtoBox.

What is Excess Pressure Losses in the Capillary Flow of Molten Polymers about?

The excess pressure losses due to end effects in the capillary flow of a linear low-density polyethylene resin (LLDPE) were studied both experimentally and numerically. First, they were determined experimentally by using two methods: i) by extrapolating experimental data of pressure drop versus length-to-radius ratios (L/R) to zero capillary length and ii) by means of using orifice dies (L/R = 0). Both methods resulted in about the same end corrections. Numerical simulation was also used to model this important aspect of experimental rheology. The con-stitutive equation used in the simulations is a multimode K-BKZ equation proposed by Papanastasiou et al. (1983, J. Rheol. 27:387) and further modified by Luo and Tanner (1988, Int. J. Num. Meth. Eng., 25:9). It was found that the numerical predictions agreed qualitatively, but underestimated the experimental data for the various geometries used to determine the end effects.

Who reads Excess Pressure Losses in the Capillary Flow of Molten Polymers?

Author

Savvas G. Hatzikiriakos; Evan Mitsoulis

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0035-4511)

Published

1996

Language

EN

Field

Chemical Engineering (Physical Sciences)